Showing papers on "Dacus published in 1979"
TL;DR: The results indicate that the genetic mechanism controlling timing is independent of that controlling response to light intensity, and that both genetic mechanisms are complex.
Abstract: . Mating in Dacus tryoni is restricted to dusk, whereas that of a sibling species, Dacus neohumeralis, occurs in the middle of the day. The timing of sexual behaviour in both species is determined by an interaction between a circadian clock and light intensity. In D. tryoni peak mating responsiveness is at the time of dusk, and the optimal light intensity for mating is approximately 91x. In D.neohumeralis peak responsiveness is in the middle of the day, and the optimal light intensity for mating is greater than 10 000 lx. The two species were crossed and the time of mating and response to light intensity of F1, F2 and backcross progeny determined. The circadian clock set a mating phase (‘gate’) as narrow in F1 flies as in their parents, suggesting the circadian timing mechanism to be common between the two species. The results indicate that the genetic mechanism controlling timing is independent of that controlling response to light intensity, and that both genetic mechanisms are complex.
49 citations
TL;DR: Substantial differences in responses of Taiwan and Hawaiian D. dorsalis suggest that perceptible evolution of the receptor protein has occurred during the past 50 years and a plausible scheme for the coevolution of dacini flies with plants containing phenylpropionoid essential oils is outlined.
Abstract: Male oriental fruit flies (Dacus dorsalis) from colonies in Taiwan and Hawaii were evaluated for limit of response to various analogues of methyl eugenol. The results are interpreted in terms of the geometry and allosteric requirements of the antennal receptor that triggers the characteristic methyl eugenol reflex. This receptor has evolved for complementarity to all portions of the methyl eugenol molecule and responds only to ortho-substituted benzenes with adjacent oxygen atoms or isoelectronic equivalents. Substantial differences in responses of Taiwan and Hawaiian D. dorsalis suggest that perceptible evolution of the receptor protein has occurred during the past 50 years. A plausible scheme for the coevolution of dacini flies with plants containing phenylpropionoid essential oils is outlined.
33 citations
TL;DR: Estimates of the weekly survival rates of adult Dacus tryoni (Froggatt) in an overwintering site at Cam- den, N.S.W., indicated that the mortalities of males and females were similar and were related to the minimum temperatures the flies experienced.
Abstract: Estimates of the weekly survival rates of adult Dacus tryoni (Froggatt) in an overwintering site at Cam- den, N.S.W., indicated that the mortalities of males and females were similar and were related to the minimum temperatures the flies experienced. When minimum temperatures remained above 0oC the weekly mortality rate remained fairly constant at an average of 8% of the population per week. When sub-zero temperatures occurred mortality increased. An apparent decrease in survival at the end of the winter, which coincided with the period when temperatures rose above the developmental threshold for maturation, was attributed to emigration of flies from the overwintering site. The results are discussed in relation to the ecology of D. tryoni in the southern parts of its range.
29 citations
1 Jan 1979
TL;DR: Field trapping offruit-flies Dacus spp.
Abstract: SUMMARY Field trapping offruit-flies Dacus spp. (Diptera: Tephritidae) using methyl etlgenol over a jive week period 1.vas conducted in afruit farm at Gombah, Selaugor, The results showed that traps with slit holes caught the greatest 11li11zber offruit-flies. Over 85% of the flies caught were male, Dacus dorsalis, Hendel. When different formulations of methyl eugenol; illa/athion 50EC + methyl eugenol, Carbaryl85S+ methyl eugenol, Diptere.'\' SP 95%) methyl eugenol and distilled 'lcater + methyl eugenol were tested at Serdang significant differences 'were only detected in tlte number of flies trapped in those traps with methyl eugenol -I- insecticides and those 'with methyl eugenol alone. The technique used 'l!,..'as eifecti'lie in controlling the fruit-flies for there nYts a reduction of20~;) of damaged carambola fruits.
12 citations
TL;DR: Two new species, Dacus (Bactrocera) allwoodi and Dacus(Didacus) hardyi, are described and figured and subgenera Dacus Fabricius, Didacus Collart and Polistomimetes Enderlein are defined.
Abstract: Two new species, Dacus (Bactrocera) allwoodi and Dacus (Didacus) hardyi, are described and figured. Subgenera Dacus Fabricius, Didacus Collart and Polistomimetes Enderlein (=Daculus Speiser syn. n.) are defined. Dacus (Dacus) armatus Fabricius, the type-species of subgenus Dacus, Dacus (Polistomimetes) minax (Enderlein), the type-species of subgenus Polistomimetes, are described and figured from their type specimens.
10 citations
TL;DR: When 3 pineapple varieties were exposed to field populations of melon flies, Dacus cucurbitae Coquillett, and oriental fruit flies, no larvae or pupae developed from them, and none of the 3 varieties was any more susceptible than the others to infestation by either pest species.
Abstract: When 3 pineapple varieties (D-10, D-20, and Smooth Cayenne) were exposed to field populations of melon flies, Dacus cucurbitae Coquillett, and oriental fruit flies, D. dorsalis Hendel, no larvae or pupae developed from them. Thus, none of the 3 varieties was any more susceptible than the others to infestation by either pest species.
9 citations
TL;DR: It has been observed in the laboratory that melon flies emit a smoke while producing a high-pitched buzzing sound at dusk, which has a faint smell of burning.
Abstract: It has been observed in the laboratory that melon flies emit a smoke while producing a high-pitched buzzing sound at dusk. This smoke has a faint smell of burning.
8 citations
1 Jan 1979
TL;DR: In general, field insecticidal treatments resulted in lower numbers of adult emergence as compared to the laboratory treatments.
Abstract: Four insecticides were tested in the laboratory and field on their relative efficacy against the larvae and pupae of Dacus dorsalis Heudel. In the laboratory studies all the insecticides 'were found to he effective against
the larvae although they were comparatively less effecive against the pupae in preventing adult emergence.
In general, field insecticidal treatments resulted in lower numbers of adult emergence as compared to the laboratory
treatments.
4 citations
TL;DR: 1.ウリミバエ幼虫を,人工飼料を用い10密度段階(20ml当り,15～8,000頭)で飼育し,幼
Abstract: 1.ウリミバエ幼虫を,人工飼料を用い10密度段階(20ml当り,15～8,000頭)で飼育し,幼虫飼育密度の幼虫期・蛹期・成虫期の発育・増殖に及ぼす影響を調べた。2.高密度になるにつれ蛹重が軽くなり,蛹化率が低下した。更に密度を増すと蛹重は約5mgで一定となり蛹化率が急速に低下した。3.各密度区で得られた蛹の羽化率はいずれも80%以上で,性比は1:1であった。蛹期間は小型の蛹でやや短かった。4.各密度区で得られた成虫の寿命は高密度区でやや短かった。産卵数もやや少なかったが,蛹重が低密度区の1/4でも産卵数は2/3であった。5.野外で採集されたウリミバエは,大きさの変異が大きく,冬には小型のハエが多かった。これは冬期に利用できる寄主が,果実の小さな野生寄主であることが原因と思われた。6.ウリミバエは体の小型化と小型の成虫の産卵数があまり減らないことにより,過密状態でも十分な次世代を残しうる。
Patent•
15 Oct 1979
TL;DR: In this paper, a green fruit of Momordica charantia (1 part by weight) is ground and mixed with 1 part of water and 1.5 parts of a solvent such as ether, methyl acetate, ethyl acetate etc.
Abstract: PURPOSE:To provide the title attractant having no sex-specificity and free from ill- odor of decomposed protein, and containing a substance attracting Dacus curcurbitae Coquillet extracted from Momordica charantia. CONSTITUTION:Green fruit of Momordica charantia (1 part by weight) is ground and mixed with 1 part of water and 1.5 parts of a solvent such as ether, methyl acetate, ethyl acetate, etc. The solution is centrifuged, and the supernatant liquid is concentrated to obtain an extract. The extract is diluted to a proper concentration, and poured into a flytrap bottle, absorbed to an absorbent, or mixed with an insecticide.